Treacy's defense was that he wasn't responsible because he suffered from severe post-traumatic stress disorder resulting from his brother's suicide a few months earlier. The attack happened after Ratley enraged Treacy by sending him a taunting text message about his dead brother.

Experts agreed Treacy suffered from the disorder, but prosecution psychiatrists testified that Treacy clearly knew right from wrong.

According to the Broward Sheriff's Office, Treacy punched Ratley in the head until she fell to the ground and then continued to beat her by smashing her head on the pavement, kicking her and stomping on her while wearing steel-toed boots.

Treacy, 17, could get up to 50 years in prison when he's sentenced. Ratley has permanent brain injuries.

"On behalf of Josie and her family, we want to thank the jury for seeing the truth and doing justice," a statement from Ratley's family read. "It is not a day to rejoice, however. This is a tragedy for all involved. Thank you to the jury for having the courage to make the right decision. It is one more step on the road to moving on with our lives as best we can."